export default {
   // 为当前模块开启命名空间
  namespaced :true,
  // 模块的 state 数据
  state:() => ({
     // 购物车的数组，用来存储购物车中每个商品的信息对象
    // 每个商品的信息对象，都包含如下 6 个属性：
      // { goods_id, goods_name, goods_price, goods_count, goods_small_logo, goods_state }
    cart:JSON.parse(uni.getStorageSync('cart') || '[]')
  }),
  // 模块的 mutations 方法
  mutations :{
    addToCart(state ,goods) {
     const findResult = state.cart.find(x =>x.goods_id === goods.goods_id)
     if (!findResult) {
       state.cart.push(goods)
     } else {
       findResult.goods_count++
     }
     this.commit('m_cart/saveToStorage')
    },
    saveToStorage(state){
      uni.setStorageSync('cart',JSON.stringify(state.cart))
    },
    updateGoodsState(state,goods) {
      // 根据goods_id查询购物车中对应的商品
     const findResult= state.cart.find(x => x.goods_id === goods.goods_id)
     // 有对应的商品信息对象
     if (findResult) {
       findResult.goods_state = goods.goods_state
       
       this.commit('m_cart/saveToStorage')
     }
     
    },
    updateGoodsCount(state,goods) {
      // 根据goods_id查询购物车中对应的商品
     const findResult= state.cart.find(x => x.goods_id === goods.goods_id)
     // 有对应的商品信息对象
     if (findResult) {
       findResult.goods_state = goods.goods_state
       
       this.commit('m_cart/saveToStorage')
     }
     
    },
    removeGoodsById(state,goods_id) {
    state.cart = state.cart.filter(x => x.goods_id !== goods_id)
    
    this.commit('m_cart/saveToStorage')
    },
    // 更新所有商品的勾选状态
    updateAllGoodsState(state,newState) {
      return state.cart.filter(x => x.goods_state = newState)
      this.commit('m_cart/saveToStorage')
    }
  },
  
  

   // 模块的 getters 属性
  getters :{
    total(state){
      // let c=0
      // state.cart.forEach(goods => c +=goods.goods_count)
      // return c
     return state.cart.reduce((total,item) => total += item.goods_count,0)
    },
    checkedCount(state) {
     return state.cart.filter(x => x.goods_state).reduce((total,item) =>total +=item.goods_count,0)
    },
    //已勾选的商品总价
    checkedGoodsAmount(state) {
     return state.cart.filter(x => x.goods_state).reduce((total,item) => total += item.goods_count * item.goods_price,0).toFixed(2)
    }
  }
}